noun
fossil
Refers to preserved remains or traces of ancient organisms.
この地域から恐竜の化石が発見された。
Dinosaur fossils were discovered in this area.
noun, noun or participle which takes 'suru', intransitive verb
fossilization; petrification
The process of becoming a fossil; can be used as a noun or with する to mean 'to fossilize'.
木の葉が化石するには長い時間がかかる。
It takes a long time for leaves to fossilize.